The larvae prey upon small aphids.

这种幼虫以小蚜虫为食。

Stronger animals prey upon weaker ones.

强大的动物捕食弱小的动物。

So it was easy to prey upon and loot them.

因此，掠夺和洗劫变得轻而易举。

The Internet can be full of dark, scary people who prey upon people's naivety and innocence.

互联网上可能充斥着各种阴森恐怖的人，他们专门利用人们的天真无邪。

Large bugs in the Lethocerinae family have been known to prey upon small vertebrates including fish and frogs.

我们知道Lethocerinae科(半翅负子蝽科昆虫的一类)的大型昆虫会捕食包括鱼和蛙类在内的小型脊椎动物。